The reconstruction of 3D object shapes and camera motions from 2D observations is an important problem in computer vision. When the object is rigid, this problem is defined as rigid Structure-from-Motion (SfM) and it can be solved reliably using existing methods like [1]}. Non-Rigid Structure-from-Motion (NRSfM) relaxes the assumption of a rigid object in SfM to a deforming one, leading to a more general and challenging problem.
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